Oxygen Ions Containing More Than Two Nuclei

Oxygen Ions Containing More Than Two Nuclei 

The O3 (ozonide) ion is the only well-established species containing more than two oxygen nuclei. Two types of Oj have been reported and have been characterized mainly by EPR. The evidence for other species is weak and their existence has not been substantiated by direct observation. 

The OJ ion is a 19-electron radical and is isoelectronic with AB2-type radicals such as SOJ and NO2- which have been observed on surfaces. In these ions, the energy levels are well separated (Fig. 21) and because they are not significantly perturbed by the surface crystal field, the g tensor can be used to fingerprint the species (96). Comparison between the g tensor 

The g tensor for O3 is discussed below on the basis of Walsh s diagram (336) for a 19-electron radical. The O3 ion is expected to be a bent radical with the odd electron occupying the 2b, molecular orbital (MO) (332) which has the form (322) 

The O3 ion on MgO was first reported by Tench and Lawson (335), with a g tensor in agreement with the theoretical arguments, and confirmed by Williamson et al. (339). Further proof of the identity of this species comes from measurements using the 170 isotope to give a hyperfine interaction (334). When the OJ ion is formed by the reaction 

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V. Oxygen Ions Containing More Than Two Nuclei.82... 

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